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Title: On the Modelling of Anisotropic Piezoelectric Diaphragms for the Development of High Subsonic Synthetic Jet Actuators
Author: Santos Mendes Gomes, Luis Daniel Teia dos
ISNI:       0000 0004 2681 8409
Awarding Body: The University of Manchester
Current Institution: University of Manchester
Date of Award: 2009
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Civil aircrafts are highly aerodynamic optimised machines. Further improvement by conventional aerodynamic development of shapes is increasingly non-cost effective. Further gains may be unlocked through the application of active flow control technologies. Industry expects high flow control authority delivered within a compact and robust design. Piezoelectric-driven synthetic jet technology is being developed towards achieving the right balance between these design requirements. The aim of the present research is to generate understanding on how geometrical and physical parameters of piezoelectric diaphragms influence the operation and velocity authority of synthetic jet technology actuators. In practice, this is achieved by developing a mathematical model that describes the physics governing the static and dynamic deflection of piezoelectric diaphragms. As a result, an exhaustive mathematical study was conducted on the vibration of unimorph piezoelectric diaphragms resulting in a complete set of solutions ready for hands-on application as a diaphragm design tool. The study was then extended to a complete actuator model, where a new transfer function was proposed. An experimental campaign was conducted to validate key features of the diaphragm theory and actuator model, and assess the performance benefit imparted by the diaphragm redesign. As a result peak jet velocities of 200 m] s were achieved, turning high subsonic piezoelectric driven synthetic jet actuators into a reality. Moreover, the key to sonic velocity relies only upon the ability to raise the pressure inside the chamber. A concept easily conceived, but how to design the actuator to achieve such high pressures by piezoelectric means is the ultimate challenge.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available